California Department of Transportation

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I-5Santa Ana Freeway Interstate 5 (I-5) High Occupancy Vehicle (HOV) Lane Improvement (0C890) Project (SR-55 to SR-57)

The California Department of Transportation (Caltrans) in cooperation with the Orange County Transportation Authority (OCTA) is proposing to improve Interstate 5 (I‑5) between State Route 55 and State Route 57, within the city of Santa Ana with the addition of one high-occupancy-vehicle (HOV) lane in each direction thus providing additional HOV capacity and reducing freeway congestion.

In addition to the HOV lane improvements, the project proposes to remove the southbound off-ramp and northbound on-ramp HOV structures at Main Street. All of the proposed improvements would be constructed within the existing Caltrans and/or local road right-of-way limits. Construction is scheduled to begin in 2018 and be completed in 2020. The project is currently in the design phase.

Aerial Photo of project area


Project Details

Final Environmental Document:  April 2015, Initial Study with Negative Declaration/Environmental Assessment with Finding of No Significant Impact

Technical Studies:
I-5 (SR-55 to SR-57) HOV Final Relocation Impact Memorandum Aug 2012

Historic Property Survey Report Dec 2012
Paleontological Technical Memorandum Jun 2014
Community Impact Assessment Apr 2014
I-5 From SR 55 to SR 57 HOV Improvement Project TAR Apr 2013
Visual Impact Assessment Dec 2012
Water Quality Assessment Report Mar 2013
Preliminary Geotechnical Design Report Feb 2013
Initial Site Assessment Report Oct 2012
Final Air Quality Analysis Report Oct 2013
Air Quality Conformity Analysis Dec 2014
Noise Abatement Decision Report Jun 2014
Noise Study Report Jun 2014
Final NES (MI) Sept 2013

Notice of Availability: